• Apple rejects Hey calendar app for not allowing non-paying users to do anything within the app.
• Hey had previously faced a similar rejection from Apple for its original iOS app four years ago.
• Hey plans to fight Apple’s decision, but the specific approach is not yet known.
You can log in without having a sub. You just need to create an account on the web.
The OP is about not being able to do anything without paying. Not about not being able to do anything without an account.
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Maybe that’s a recent change. I know I was able to log in, browse and add to watchlist a few months ago without having an active sub.